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Three versions, one goal. PrepAwayETE built its 70-357 package for different tastes and different countries: a printable PDF, a Windows Desktop Test Engine with realistic simulation, and an Online Test Engine for any browser — 55 practice questions in each, all included together.
| Certification Vendor: | Microsoft |
|---|---|
| Exam Name: | Developing Mobile Apps |
| Exam Number: | 70-357 |
| Real Exam Qty: | 45-60 |
| Related Certifications: | Microsoft Certified Solutions Developer (MCSD): App Builder |
| Passing Score: | 700/1000 |
| Exam Price: | USD 165 (approx.) |
| Exam Duration: | 150 minutes |
| Available Languages: | Simplified Chinese, Japanese, German, Portuguese (Brazil), Russian, Spanish, French, English |
| Exam Format: | Performance-based questions, Multiple Choice, Drag & Drop, Multiple Response |
| Certificate Validity Period: | Retired (No longer available as a current exam) |
| Sample Questions: | DOWNLOAD DEMO |
| Exam Way: | Onsite (at Pearson VUE test centers) and online proctored options (when offered before retirement). |
| Pre Condition: | Candidates should have experience in mobile app development with C#, XAML, MVVM, Entity Framework, and Visual Studio. No formal prerequisites beyond experience. |
| Official Syllabus URL: | https://learn.microsoft.com/en-us/learn/certifications/exams/70-357 |
| Section | Objectives |
|---|---|
| Topic 1: Develop User Interfaces | - Implement responsive and adaptive UI behaviors - Develop a XAML page layout for an adaptive UI |
| Topic 2: Authentication & Security | - Manage authentication and identity management |
| Topic 3: Navigation & Lifecycle | - Evaluate custom navigation patterns - Implement page navigation and lifecycle events |
| Topic 4: User Interaction & Controls | - Manage user input and custom interactions - Create and use custom controls |
| Topic 5: Feature Detection & Components | - Implement notifications, background tasks, and reusable components - Implement feature detection for adaptive coding |
| Topic 6: Data Management | - Access cloud data and Web APIs - Implement data access and data binding |
The 70-357 exam is a Microsoft certification exam that validates the skills defined in the Microsoft Developing Mobile Apps syllabus above. It forms part of these credential paths: Microsoft Certified Solutions Developer (MCSD): App Builder. In an economy where certified skills carry growing weight, this credential is one of the clearest ways to demonstrate professional capability in 2026. PrepAwayETE prepares you with 55 practice questions in PDF, Desktop Test Engine, and Online Test Engine formats.
Microsoft recommends the following training for the Microsoft Developing Mobile Apps exam:
Follow the training with repeated self-testing — the 55 practice questions from PrepAwayETE let you rehearse each topic as often as needed until it holds.
The written refund policy applies: take the Microsoft Developing Mobile Apps exam within 60 days of purchase, and if you do not pass, PrepAwayETE refunds you in full. The policy does not apply if the exam is taken within 3 days of purchase, if the exam was never actually taken, or to free materials or expired orders, and the candidate name must match the payer name. Submit a scan of your enrollment slip and the official Score Report PDF within 2 days of the exam; claims are processed within 7 days. You may instead exchange for two free exam products of equal value and keep your original update service. Delivery is by email within 1 minute of purchase — contact support if nothing arrives within 2 hours.
You pass the Microsoft Developing Mobile Apps exam at 700/1000, and registration costs USD 165 (approx.). Since retakes cost the full fee again, repeated simulation runs with the PrepAwayETE engines are the economical way to confirm readiness first.
Onsite (at Pearson VUE test centers) and online proctored options (when offered before retirement). Register for the Microsoft Developing Mobile Apps exam via these official channels:
Once booked, your PrepAwayETE practice questions — delivered within 1 minute of purchase — let preparation begin the same day.
Three versions of the 55 practice questions for the Microsoft Developing Mobile Apps exam: a printable, expert-prepared PDF with instant download; a Desktop Test Engine for Windows whose simulation test reproduces the real exam atmosphere — repeatable as many times as you like, with two practice modes and offline access; and an Online Test Engine for any browser on Windows, Mac, Android, and iOS with test history and performance review. Included as well: a free demo, 365 days of free updates, a 50% renewal discount afterward, unlimited computer installations, and 24/7 online after-sales service.
Candidates should have experience in mobile app development with C#, XAML, MVVM, Entity Framework, and Visual Studio. No formal prerequisites beyond experience. Requirements are revised from time to time, so verify the latest on the official Microsoft exam page before scheduling.
The Microsoft Developing Mobile Apps exam consists of 45-60 within 150 minutes. The PrepAwayETE simulation test runs under the same conditions, so you can get accustomed to the atmosphere and work out any pacing habits before they cost you points.
Per the official outline, the Microsoft Developing Mobile Apps exam covers 6 domains, led by Develop User Interfaces, Data Management, and User Interaction & Controls. The complete list appears in the topics section above; the 55 practice questions at PrepAwayETE span every domain.
Drag and Drop Question
You are developing a Universal Windows Platform (UWP) app.
A user terminates the app.
You need to ensure that the app initializes when the user starts the app.
How should you complete The method? To answer, drag the appropriate code segment to the correct location or locations. Each code segment may be used once, more than once, or not all.
You may need to drag the split bar between panes or scroll to view content.
Correct Answer:
You are developing a Universal Windows Platform (UWP) app.
Your app stores files on a user's device.
You need to be able to replace the existing files with new files generated by the user.
Solution: You run the StorageFile. OpenSequentialReadAsync method to replace the existing file.
Does this meet the goal?
Correct Answer: A 🗳️
You need to implement the appropriate XAML layout for the Timeline app.
Solution: You create an instance of a SplitView control.
Does this meet the goal?
Correct Answer: B 🗳️
Your are developing a Universal Windows Platform (UWP) app that uses XAML and C#.
The app must use the Model-View-ViewModel (MVVM) pattern.
The user interface (UI) triggers an event.
You need to bind the event to a view model method.
What should you do?
Correct Answer: C 🗳️
Hotspot Question
You need to properly handle the size of the user interface objects.
How should you complete the method? To answer, select the appropriate code segment from each list in the answer area. NOTE: Each correct selection is worth one point.
Correct Answer:
Topic 2, Background
You are developing a Universal Windows Platform (UWP) app for LitWare, Inc. that will assist video artists. The app allows artists to create videos, share videos through other mobile apps, and upload the videos through LitWare, Inc's web services. What helps set LitWarelnc's app apart from competitors is their focus on speed and performance.
Business requirements
Support many devices
Users may have phones, tablets, or laptops. The app must support all devices with a fluid layout that grows off-screen and adapts to each device.
Record video
Users must be able to record videos and view them in their videos library .
The app must display information about the recorded video .
Users must be able to edit the upload queue in the app.
Branding
The app must allow deferral and scheduling of video uploads.
Users must be able to view the status of video uploads.
Any videos created with this app or shared with this app must be uploaded without user interaction.
Download video
The app must have the option to automatically download videos.
Users must be able to initiate downloading of videos.
Share video
The app must allow be allowed to receive videos from other apps.
Technical requirements
Application structure
Technical requirements
Support multiple devices
The app must support the following:
- Use horizontal layout for larger screens .
- Use vertical layout for smaller screens .
- Use one layout control per view.
The app must be compatible with current and future XBOX app that use C++.
Uploading and downloading
The app must use a background operations to upload and download videos.
Code reuse
The app must use a common pool of XAML resources and custom controls.
All custom controls must use a consistent theme throughout the app.
You must create code that can be reused in C++, C#, JavaScript, whenever possible.
The app must call the background service to avoid duplication of code.
Security
End users must be authenticated using OAuth.
Web services must be authenticated.
Users must have the option to use single sign-on.
Recording
The app must use the microphone and webcam to support audio and video recording. In addition, the app must support the use of the back camera buttons, if present.
Integration:
Other apps must be able to share videos with this app through a Universal Windows Platform (UWP) Architecture and coding style The app must follow the Model-View-ViewModel (MVVM) pattern.
The app's user interface (UI) must be optimized for performance.
The app must use compile time coding techniques over runtime.
Package appxmanifest
Relevant portions of the app files are shown below. Line numbers in the code segments are included for reference only and include a two-character prefix that denotes the specific file to which they belong.
Background Task
Relevant portions of the app files are shown below. Line numbers in the code segments are included for reference only and include a two-character prefix that denotes the specific file to which they belong.
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